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Cambridge, MA, United States

Kasaian M.T.,00 Cambridge Park Drive | Marquette K.,Pfizer | Fish S.,00 Cambridge Park Drive | DeClercq C.,00 Cambridge Park Drive | And 10 more authors.
American Journal of Respiratory Cell and Molecular Biology | Year: 2013

IL-4 and IL-13 comprise promising targets for therapeutic interventions in asthma and other Th2-associated diseases, but agents targeting either IL-4 or IL-13 alone have shown limited efficacy in human clinical studies. Because these cytokines may involve redundant function, dual targeting holds promise for achieving greater efficacy. We describe a bifunctional therapeutic targeting IL-4 and IL-13, developed by a combination of specific binding domains. IL-4-targeted and IL-13-targeted single chain variable fragments were joined in an optimal configuration, using appropriate linker regions on a novel protein scaffold. The bifunctional IL-4/IL-13 antagonist displayed high affinity for both cytokines. It was a potent and efficient neutralizer of both murine IL-4 and murine IL-13 bioactivity in cytokine-responsive Ba/F3 cells, and exhibited a half-life of approximately 4.7 days in mice. In a murine model of ovalbumininduced ear swelling, the bifunctional molecule blocked both the IL-4/IL-13-dependent early-phase response and the IL-4-dependent late-phaseresponse. Intheovalbumin-inducedlunginflammationmodel, the bifunctional IL-4/IL-13 antagonist reduced the IL-4-dependent rise in serum IgE titers, and reduced IL-13-dependent airway hyperresponsiveness, lung inflammation, mucin gene expression, and serum chitinase responses. Taken together, these findings demonstrate theeffectivedualblockadeofIL-4andIL- 13withasingleagent,which resulted in the modulation of a more extensive range of endpoints than could be achieved by targeting either cytokine alone. Copyright © 2013 by the American Thoracic Society.

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